delegates

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• Single and multicast delegate

• event, event_args and event_handler are base classes for eventing.

• action represents a delegate that has variable parameters and does not return a value.

• func represents a delegate that has variables parameters and returns a value of the type specified by the result_t type.

• predicate represents a delagate that defines a set of criteria and determines whether the specified object meets those criteria.

• overload represents class that use to determine one of const and non const overloaded methods.

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